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Finding the Fourth Proportional to 811,960.30, 1,217,940.45 and 212,920.30

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Solution

The fourth proportional to 811,960.30, 1,217,940.45 and 212,920.30 is: 319,380.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,960.30 : 1,217,940.45 = 212,920.30 : x
  2. Step 2: Convert to fraction form
    811,960.30/1,217,940.45 = 212,920.30/x
  3. Step 3: Cross multiply
    811,960.30x = 1,217,940.45 × 212,920.30
  4. Step 4: Simplify right side
    811,960.30x = 259,324,245,996.14
  5. Step 5: Solve for x
    x = 259,324,245,996.14/811,960.30
  6. Step 6: Final answer
    x = 319,380.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.